WFD Sink Image Orientation Control via RTSP Feedback
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Solution Overview
Problem
Current wireless display technologies, such as WiFi Miracast, do not allow for dynamic changes in the orientation of images during wireless video streaming between devices, limiting user flexibility in viewing multimedia content on larger screens.
Innovation Solution
A method and device using Real-Time Streaming Protocol (RTSP) messages to request and manage video stream control parameters, enabling the change of image orientation between WiFi Display (WFD) source and sink devices over a peer-to-peer link, allowing users to control the resolution and refresh rate of multimedia content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wireless display transmission technology (Miracast) is used to enable video viewing on large-screen devices, then portability limitation is overcome and multimedia content can be viewed on larger screens, but the screen size remains fixed and cannot be dynamically adjusted for different viewing scenarios
Solution Approach 1:
The patent applies dynamics by enabling the WFD sink device to dynamically change the display orientation (landscape/portrait modes) during wireless video streaming. This allows the screen area to be adaptively adjusted based on different viewing scenarios while maintaining the wireless connection, transforming a static display system into a dynamic one that can respond to user needs.
2Productivity
If mirroring technology is used to transmit mobile device screen wirelessly to large-screen devices, then real-time pixel information transmission is achieved without service dependency, but the image orientation cannot be changed during transmission
Solution Approach 1:
The patent enables dynamic orientation switching capability in the WFD sink device, allowing the received video stream to be displayed in different orientations (landscape, portrait, or rotated modes) while maintaining real-time wireless transmission. This adds flexibility to the mirroring system without compromising transmission efficiency.
3Ease of operation
If WFD sink device is configured to receive and render video streams from WFD source, then wireless display functionality is achieved, but the device lacks capability to dynamically control video stream orientation parameters
Solution Approach 1:
The patent implements feedback mechanisms where the WFD sink device can send control messages (RTSP M21, M3) back to the WFD source device to request orientation changes and retrieve capability information. This feedback loop enables the sink device to actively control and adapt the video stream parameters, transforming it from a passive receiver to an active controller.
Solution Approach 2:
The WFD sink device is equipped with self-service capabilities to autonomously control the video stream orientation by sending RTSP control messages to the source device and processing the responses. This allows the sink device to independently adjust display parameters without requiring manual intervention or complex external control systems.
Data Source
AI summary
A method for changing an orientation of an image by a WFD sink may comprise the steps of: transmitting, to a second WFD device, an RTSP M3 request message for requesting information on a video stream control RTSP parameter of the second WFD device by a first WFD device; receiving an RTSP M3 response message in response to the RTSP M3 request message from the second WFD device by the first WFD device, wherein the RTSP M3 response message includes a video stream control RTSP parameter for a video stream control capability of the second WFD device, transmitting a first video stream displayed in a first orientation on the second WFD device to the second WFD device by the first WFD device; receiving an RTSP M21 request message from the second WFD device by the first WFD device, wherein the RTSP M21 request message requests a change into a second video stream displayed in a second orientation on the second WFD device of the first video stream; and transmitting an RTSP M21 response message to the second WFD device by the first WFD device, wherein the RTSP M21 response message indicates the acceptance of the change.